Next generation Bluetooth headset for noisy and explosive environment. Integrated, programmable analog/digital two-way radio, noise-cancelling microphones, and ambient listening. Neckband


3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset

Analog/Digital 2-way radio Headset

The 3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset is the next generation protective communication solution. With an integrated, programmable analog/digital two-way radio, Bluetooth® wireless communication, noise-cancelling speech microphones, and automatic level function for ambient listening, the 3M WS LiteCom Pro III Ex Headset not only helps protect you against potentially hazardous noise, but also makes it easy to communicate in noisy environments and helps you maintain situational awareness.

Key Features

  • Programmable analog/digital DMR two-way radio communication
  • Bluetooth® multipoint functionality
  • Water tight speech microphone (IP68)
  • Automatic level function for ambient listening
  • Voice menu with multiple language selection
  • Push-to-Listen function
  • Rechargeable battery, Li-Ion
  • Voice operated transmission (VOX)
  • Busy channel indication
  • Auto power off function
  • Battery status indication
  • IS (Intrinsically Safe) approval ATEX/IECEx


The 3M PELTOR WS LiteCom Pro III Ex Headset, ATEX-approved, offers wireless communication in noisy environments. Can be used for work in Oil & Gas Industry, Mining and where intrinsic safety products are required. Approved for use in potentially explosive environments in accordance with the ATEX directive and the IECEx scheme for dust, gas and underground mining.

Standards and Approvals

MT73H7*4D10EU-50 is in conformity with the provisions set out in the PPE directive 89/686/EEC, RED directive 2014/53/EU and the ATEX directive 2014/34/EU.
The product has been examined by; Finnish Institute of Occupational Health (Notified Body #0403), Topeliuksenkatu 41 b, FI-00250, Helsinki, Finland.
EMCCert DR. RAŠEK GmbH, Notified Body #0678, Störnhofer Berg 15 91364 Unterleinleiter Germany.
DNV Nemko Presafe AS, Veritasveien 3, 1363 Høvik, Oslo Norway, Notified Body #2460.

Intrinsically Safe

MT73H7*4D10EU-50 headsets are ATEX and IECEx certified and approved by DNV Nemko Presafe AS for use in potentially explosive atmospheres. EC-Type Examination Certificate Number:

Presafe 16ATEX8960XCertificate IECEx (IECEx Presafe 16.0086X)
M1 Ex ia I Ma -20°C ≤ Ta: ≤ +50°C Ex ia I Ma -20°C ≤ Ta: ≤ +50°C
II 1G Ex ia IIC T4 Ga -20°C ≤ Ta ≤ +50°C Ga Ex ia IIC T4 Ga -20°C ≤ Ta ≤ +50°C
II 1D Ex ia IIIC T130°C Da -20°C ≤ Ta ≤ +50°C Ex ia IIIC T130°C Da -20°C ≤ Ta ≤ +50°C


MT73H7F4D10EU-50 3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset, 403-470 MHz, Analog/Digital, Ex, EU version, Headband
MT73H7P3E4D10EU-50 3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset, 403-470 MHz, Analog/Digital, Ex, EU version, Helmet
MT73H7B4D10EU-50 3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset, 403-470 MHz, Analog/Digital, Ex, EU version, Neckband

Technical data specifications

ModelWeight (with ACK082)
Headband: 521g
Helmet attachment: 512g
Neckband: 475g

Built-in Two-way Radio

Frequency range: 403 – 470 MHz
Operation mode: Simplex
Channels: 70 programmable channels
Channel separation: 12,5 kHz and 25 kHz
Modulation: Analog: 2,5 kHz (FM) and 5 kHz (FM)
Digital: 2,5 kHz (4-level FSK)
Microphone type: Dynamic (MT73)
Receiver sensibility: Typical -120 dBm
Selective squelch: Programmable (supports CTCSS and DCS)
Output power: 200 / 20 / 10 mW ER
Range: Outdoors up to 2 km hinge on conditions
Operating temperature: -4°F (-20°C) to +122°F (+50°C)


Li-Ion battery: ACK082, included
TCharging time: aprox. 12 hours
Capacity: 3,7 V, 1350 mA, 5 Wh
Operating time: 8 hours * (90 stby / 5 tx / 5 rx)

*can be increased up to 12 hours with the power save feature


Conditions: -20º C - +55º C, < 90% humidity
Recommended max. shelf life:: Headset: 3 years
Battery: 1 year

In the box

  • 1 x 3M™ PELTOR™ WS™ LiteCom Pro III Ex. Headset
  • 1 x Battery (ACK082)
  • 1 x Power supply FR08
  • 1 x Cable AL2AH (for ACK082)
  • 1 x Hygiene kit HY83
  • 1 x User instruction
  • 1 x Intrinsic Safety Guide

Laboratory Attenuation (EN 352-1:2002)

MT73H7F4D10EU-50 (EN352-1:2002)

Mƒ(dB) 18.6 24.3 33.6 36.8 35.5 39.4 35.5
Sƒ(dB) 2.9 2.4 2.4 3.4 2.9 2.5 3.4
APVƒ(dB) 15.7 21.9 31.2 33.4 32.6 36.9 32.1

SNR= 33dB,H= 34dB, M= 31dB, L= 23dB

MT73H7B4D10EU-50 (EN352-1:2002)

Mƒ(dB) 17.7 23.9 32.5 36.2 35.6 39.5 37.1
Sƒ(dB) 2.8 3.1 3.9 3.1 2.5 2.9 2.3
APVƒ(dB) 14.9 20.8 28.6 33.1 33.1 36.6 34.8

SNR= 32dB,H= 35dB, M= 30dB, L= 22dB

MT73H7P3E4D10EU-50 (EN352-3:2002)

Mƒ(dB) 18.1 23.2 32.0 36.4 34.2 40.2 34.5
Sƒ(dB) 3.3 1.8 3.4 2.7 1.9 2.5 4.6
APVƒ(dB) 14.8 21.4 28.6 33.7 32.3 37.7 29.9

SNR= 32dB,H= 33dB, M= 30dB, L= 23dB


The 3M™ PELTOR™ WS™ LiteCom Pro III Ex Headset operates on radio communication frequencies that may be subject to end-user licensing by local government agencies. The user is responsible for contacting the local government agency and obtaining any necessary licences prior to using the two-way communication radio.

WARNING: 3M strongly recommends individual fit testing of hearing protectors. If the NRR or SNR is used to estimate typical workplace protection, 3M recommends that the noise reduction value be reduced by 50% or in accordance with applicable regulations.


Data sheet

Attenuation (SNR)
Explosive environments
Level dependent function
High (more than 31dB)

Specific References

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